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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9a1018b5880f7a6f3b67e804dc8d034d6747eb1282d8d20ba86b6257905a7d' 
  AND token = 'zfa5X1yYa2gTwQDyy2GNUckA/MbKFGY3G1clikk2v/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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