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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fb4c59156c176b68b271a505603063da0beb3e3e7ad4e5c5ef8ab6c0bedf27' 
  AND token = 'Ha4iBZmP8gwXnH0zYxy+/j+DamdbGYITy6GFs0AMibI=' 
  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"
    }
  }
}