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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e0b4d2468221f43084559b4952a91a32e38a01737d41ca65bf7922c9e9f014' 
  AND token = 'dkfHb6h1AV7Apcrwzp+EQLhSAeHDaMq2WM+YC9FN5LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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