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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be653846de2b214e393e7b9f13d75dc9dfb9cd4251ad8feb032fa0d142b201b' 
  AND token = '2JII3iMnmUSx5m/GdY5vkZvK70hjKQSKXA324H4aPq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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