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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c9359ef780278843acfd31e1b7e08103118849afe5c87fc7a47a6e8f16d70f' 
  AND token = '+8vZ7bI5BuJd1p5KK7xAD6ZjkEAguhkuhnDyRIVD4kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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