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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08901cb2c7b0644bd03a92c1968c25e9c18b4b6972cbc9e7295e0e956d300ad0' 
  AND token = 'TBVuJ6o1mNCKFnEWt3Aj/n+UeDOp6AZgmPhp2vI3vIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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