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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5612f683a14de6811feb84a899a28a7f22923e32c34411f70666545cc9ed7da' 
  AND token = 'uGGRbMa0kGvQ/0n25bwtZWiKmC1uCQwNMF0DXE7IA2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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