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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c75be151d549c9902b05a2cccf142de5ee2e705384fe679066797d50fe22f6' 
  AND token = 'Gpd7qHYH/CXiI5B40uaROQdza5K2jpb2z1YK2qiaZI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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