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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0f27ba7e44555a4020999a1330bc88f3928c031e57f6b432297b0aa009b847' 
  AND token = 'm7pKlGk0OZJZ+z6kZgAf6nEupy15LwpuKbzRr0EIIYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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