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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351136caf9422903c00bc8c9e0a8a13ab86cffef2e523910b95cdd0a7c27b3f8' 
  AND token = '1ntNpLQ/qo8BhvkTWX8da1q5dXcP4aU5N5/UHaZF+l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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