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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b4bfe921013a5cf9674db1c7bc188d61e757ebb771034dbb42737b5492b093' 
  AND token = 'cwzgDp7hpfUN0F7z931viiR4LQB4JZlM6dbt2BAtDf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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