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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6a5fa4eae3f80da1ffda4ba5f480df6c0248983470c7324d23ba107c38c625' 
  AND token = 'JW3PZHb2WWUYexQCQOMCq2n18+t0khuH/aX4drgndGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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