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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0697ca02c74a8c9e5c1aab2b8fc5986045b5f491cd1f559b2cedf8e89bc5663' 
  AND token = 'sa8FAy470ulUm9abO0AF3jwnqJWGSZ0OrIgEqihoW0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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