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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c8970027782c7ae5324b22ebbc155c2057a7b87c9c9d92786da2e0752b5f2d' 
  AND token = 'g1VmZ7EKFmMJ5a1AA9TZtAoq1oY4AIgS1LvdLzTDTfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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