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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d0479358c8be8da7edd24017c1a2abe4e2f1ec15e81a75e44dee9a68cd1d57' 
  AND token = 'u2Yucr5UvdBK669cykupRh17ykYGBc66600/ypGetQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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