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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7d84e2371f672248e35832ae1836c65a1785065ea4c0ba8ba45d568b71707d' 
  AND token = 'Ms8wYc787Z0zNffFbqNA/cmgVrILlBOWR2Nk0wd13po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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