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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9aac696a4f67718d72f8086df51aa7715497f9b94c10c41f2537dc39517cf2' 
  AND token = 'V2gDgH95hbXrd4b/97nLPTDVE+X9lk4oI2DFLLNOemM=' 
  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"
    }
  }
}