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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e874ebcafe2c3a574905cdd7ac14474f1585550de90869d6e4edede4d457f8' 
  AND token = 'tsIDf2DYQzgLdhuz/5Cw8ypb4tz9gg8iD+xJ6uRzTFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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