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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8a2cd749fdc4f3f65c43d22c6617a6379962ae952b788bcde79f8c2324ed3d' 
  AND token = '0IzTmPK5QISlPEUAUQb4daPhy3Bq9PZ4AO4gNnh0g2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}