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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e452fd2098f7c6abe10abf38ef9675bf3bd0b44e5cb096d5561fbf7c0a5e56d3' 
  AND token = 'dU8MTdMMt5c0tAqB6uxCTUZFkyew+1fHFAu7MdLIrpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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