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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9f5196fb3f9d0166d7f2dedf57c63cc23cc586d12be853d6ad03de2b3b8b90' 
  AND token = '8OGLO3NlD60/Hl+aNyzKUFptsSlnzBRri55ET4skR9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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