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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac94812ee1b7a1bd20a251b2c833204bc9b3ebdff385d54523e0e48fd4a1a1aa' 
  AND token = 'KTzkZinEoa5wzHKfFXpVUCSForGcXvqlW2fh3BIV8iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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