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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856dcff3a5a4890dd67f367d36d679b8136e536138e9ecde63ad8df7d7866205' 
  AND token = '7yCi4jzPMRH+wFWy1ZIwyQTtaQlSRvU42HP5+P42WwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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