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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb2a66fd3ec1b9d044232b27c4f983f0020453006ed146593d26022daebd133' 
  AND token = 'tzNp/lWGScN6P3KI9BuwR7TOkeAv8ifqJU5RGbJu1Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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