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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef887193e55041b0742a2b45a9f1e8682cfffa6b5990f7ca1b3ec8dd26aa6b58' 
  AND token = 'J2HvTBRAY6pfEYal8Kg1En/yI4pE8sGZIQpTz6IBNnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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