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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56eb262dd0dcbc8cc14b7f2102fc4e2f26b8e7cc3536242a9d44ead7babd4138' 
  AND token = '49s8mzeLXmES6AXRwFPPYy989gwZ1p+EREssluSToNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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