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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c4896f2a64ddac1aa0aad7604b1c1810bd4eddcdd157b37bc30cbd5e4dd485' 
  AND token = '4siY4mSYRsIOLE5zJfV1Na0B8R5wwXfNJv2uy4TnEXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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