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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2229c818b32b90dea7877f0ef6fb26ae8bf3d165fb305f323f0b94d01a48db43' 
  AND token = '0MLnuFPgFGF2Y4rGXcvFQbJ7fS9O8wertQYW9SsF4KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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