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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee47309946890fd63ce0db0b6ade1f04770f96ed66261d7f8d0a8b5c6d09a49' 
  AND token = 'IQQ6FFRsf4Y5KGxE61E/2Rkr00vbQnXFgSCDWQf+Uvw=' 
  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"
    }
  }
}