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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf75bfe8b71311f6d6f0ddfd5408509879cd69ce6195894ffe565d5d1dda4ad' 
  AND token = 'K5A02g9EuGsMChzXyyguR1Y+oC0tP07L7l02nVnqDuI=' 
  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"
    }
  }
}