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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a6a8f978a8520a61e34a09a5acd46db9892ff53fca60fadac75ebb9241fab3' 
  AND token = 'CgmvwI0hNTAXlOgRsLXHoNeMXI2msyTne02A/8+hHMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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