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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e7e525ed400a7b2e9b41fef64c42c0bb3153230ee3e78f93d39f0905d0500e' 
  AND token = 'eeCV708etNXu43Hjs+6nvgck6Rpb3Q6afB4v7ixlASc=' 
  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"
    }
  }
}