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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f823279a9d58e66cd95e37ca63879b74989b2afbeaae89f236ae1f2d26fa521' 
  AND token = '+abvyljzEot+mxexr1yTHmyvPK3Pb2/xFdvAatC/T/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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