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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabee6652a5754db7fd905ce7e92d17d3a9a7cec4b0bf40afe746e6caf9da8a9' 
  AND token = '12IpJi0i7NLCGcmaqP/tGg8qrTdtl6fZ7VN1H0RybAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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