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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561d5af9f258ee635c3cb3f4ca35d8247fb59f5a43aba8a807f0091a38c1e8b9' 
  AND token = 'Iy1iwphuPI61Af1BFDFS3siWckbBJfVMcZ6aLPDY1ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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