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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6508f35b3738b9d58416058dde96d5eefb08663ee1548908dad15f53999cbd0' 
  AND token = '892obsPmpxXveZjB0rZqwPwJL4fPtk/PdX6bebY2W+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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