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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b4731fc6f390e681c8611bead2bd9b9b61da5bf7428fb940801bc3a3a19a96' 
  AND token = 'tBS52kyBb2CXfuLCJS7agKXMmtk2ICbaLFBnWcP0yOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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