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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c1981121f30057e44143575ca0cc1d9e32a107d15e456d8214eb6a5c8dd53a' 
  AND token = '7xTvwsP+w4DtoWFMuUXsoBd4/PYkhUtQgDU5Lo0qxYM=' 
  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"
    }
  }
}