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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7e6d084734c26d5c183581e8ee7c75ba3cc9f4b95360b38bfff6d7db6404d0' 
  AND token = 'M2F4f2SDjd+KeMXn/qTUPIBcMeeoDLwv2HT2qD1YF4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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