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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af907e2aef27fec803f128d3d4bf9810055b2e90cd6a983394a9a70246dbe0f4' 
  AND token = 'ql3S///L2owAEAlgCEGS7mPd0Q43eQGgeLDE2zzE0ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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