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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7b85efd114dfc3b3e8b2dc324b33b4153394fe05e503d665ccd8c3b21ad4d0' 
  AND token = 'RaBv/BBaXyi85yhK/mSKw08logDfbsVI4W9hT8A0XfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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