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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7048454a8b3aa70acd069ed2904b84301c37f061d40d9505e486732c33fb5b8' 
  AND token = '4qs1CuRyf3S4y9QeIaGGuYA3kkSuF8eF/A6k2F5vNvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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