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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1b0f0eeed6a3d66d3903fcdcc3fa750d2c0095675502cd74ae00d29dbd1eaf' 
  AND token = 'QTPQDBoZLTlW7F5HsBp+StqDKI8wFgGoqwie2y6c//c=' 
  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"
    }
  }
}