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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c6172efc5708dee93e0dda03782b8f05649253be70ae6a8da1d1103638a533' 
  AND token = 'jrLNqSoCLArO9favgnn8jG2emfpRNyh9tv258r4o+MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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