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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409e8fac58296e17b35e94bae82cbcca1951dabd45e3af1ce1b486494e29b4e3' 
  AND token = '1jOl0djfjh2tAxNgM1A9zETfXHVBeNzld1o/t8U2JBM=' 
  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"
    }
  }
}