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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b53cec56ab6189a2090965ea85d50f4dc0e61ba0f5aff35318929ccb46b2bd' 
  AND token = '3unlSzAPcN9it2z+BXdMixCeDA3Nj86/uUIj70Fs8T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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