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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f460320b3138602bb22430db64c8dc0c8b5cc9ee5babbfb412545c49f025e6' 
  AND token = 'nH6Q9zePIhDhBdUqvjQI2n8wu8ZBBMH/VrI+RFrts8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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