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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b70cf04ba0a11b17e9089882c4dfe92d6f7f7603172d689f435d16d01e3d17c' 
  AND token = 'tIflrFHiI+yMqXlSqp7KNICNrJxz/o3Ak5yJbiWxcjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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