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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48767a3bd28ab7c213ac20b3f0372c373c665ab4d83e836a1d1b2ec57497e7f' 
  AND token = 'B3iHs9F4yrbv3y9GAoxeMv6bJkX9z0d6HshGf35Q53c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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