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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcc92723c7e84a0601ec4e3d23253665bf4d52c089003c333d17c43828f7386' 
  AND token = 'b8W1QF4e0EfPEbTmFmQVQgy2vz+Et4kUx18QydFU+04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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