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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855060f4b6001bc9b506c8c966ac98de5ca4ef6e78f2e260c86b84d1ef179900' 
  AND token = 'U+v+FAObnuwoR9afT6p+mv7PP8R/47SAIGpn7EcQ/Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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