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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6745fee22bb1a4e55caefd9761f8301742bb924503749f8927a9789a5d0e92' 
  AND token = '7L3NQ2qFGmgrbG1OOHr2oLAnD7sCDYCYV4ANl1DygpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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