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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e480f198f5f596a54c1f7cac03c8441c0e32c309e1c2d233c3d05632a2ebc9fb' 
  AND token = 'na0kS9EQ3Aaul8J1IMoXC1IcD1TpupwiviWsZ3UHUss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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