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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e81b0717272c9d9464a7039cf45c1ac0245ad3f06df13147da64eb601a2de20' 
  AND token = 'LadKHymKiNcWK0+NhVFb9+hGRdsLpokI3DZEHA/NHwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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